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The Moon is Earth’s only natural satellite, circling the planet at an average distance of roughly 385,000 kilometers (239,000 miles).  With a diameter of just under 3,500 kilometers (about 2,160 miles), the cratered surface of the rocky object is one Read more…


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A mineral that repeatedly turns up on Mars has been found in perhaps the last place on Earth you might think to look. Deep – really deep – in the Antarctic ice, scientists have found jarosite, a tawny-hued mineral that’s Read more…

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